High Quality Content by WIKIPEDIA articles! The Fitchburg Line is an MBTA line that runs from Boston`s North Station to Fitchburg, Massachusetts. The line is along the tracks of the former Fitchburg Railroad, which was a railroad line across northern Massachusetts, United States, leading to and through the Hoosac Tunnel. It is one of the more scenic commuter rail lines, passing by Walden Pond between Lincoln and Concord. At nearly 50 miles, the Fitchburg Line is the second-longest line in the system, and ranks as one of the worst lines in terms of on time performance. The MBTA attributes this to the facts that the line has the oldest and least adequate infrastructure in the system and commuter trains must compete with freight traffic, mainly between South Acton and Ayer. Despite this, the Fitchburg Line still draws about 10,000 daily riders, and the MBTA expects it to draw even more once upgrades to the line are completed.